Boring-bit.



F. KONIECZKA.

BORING BIT.

APPLICATION FILED MAY 14. 1914.

Patented Jan. 25, 1916.

UNTTFQE %AT% PATENT @FFTCE.

FRANK KONIECZKA, OF CHICAGO, ILLINOIS.

BORING-BIT.

Specification of Letters Patent.

Application filed. ma 14, 1914. Serial No. 838,505.

To all whom it may concern Be it known that I, FRANK KONIECZKA, acitizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented new and useful Improvements inBoring-Bits, of which the following is a full, clear, concise, and exactdescription, reference being had to the accompanying drawing, forming apart of this specification.

My invention relates to improvements in wood boring tools.

Heretofore it has been found difficult and at times impossible to boreholes of any considerable size, especially when working in hard wood,with the ordinary form of portable hand tool. For example, plumbers,electricians, and the like who are frequently called upon to cut fairlylarge holes in hard oak floors experience much difliculty and annoyancein the operation. Sometimes the hole will be cut by boring a circle ofsmall holes. Tools have been devised with a view to boring large holes,but it has been found that it is oftentimes impossible to obtain theproper amount of leverage without complicated rigging and there is greatliability of breakage.

It is one of the. objects of my invention to provide a portable,manually operated bit capable of cutting holes of considerable size andone that will operate equally well in soft wood or hard.

Further objects of my invention are to provide such a bit that may beused with the ordinary form of hand brace; to provide a bit of the sortdescribed that is adjustable for boring holes of different diameters; toprovide such a bit that takes the strain in such a way as to avoid thedanger of breakage; to'provide improved forms of cutters cooperating inattaining the desired ends; and to provide a bit of the characterdescribed that is economical to manufacture, easily carried about andreadily operated.

Additional objects and advantages of mv invention will be apparent fromthe following description taken in connection with the appended claim.

I have described in the following specification and illustrated in theaccompanying drawing, one embodiment of my invention, as an example, itbeing clearly understood that changes may be made in the form,construction and arrangement of the parts without departing from thespirit of the invention or exceeding the scope of the appended claim,the form of invention herein disclosed being merely one preferredembodiment thereof.

In the drawing: Figure 1 is a view in front elevation of a bitconstructed in accordance with my invention; Fig. 2 is a crosssectionalview taken on the line 2-2 of Fig. 1, looking in the direction of thearrows; Fig. 3 is a similar view taken on the line 33 of Fig. 1; Fig. 4is a cross sectional View of a portion of the shank showing amodification; and Fig. 5 is a cross sectional view (enlarged) taken onthe line 55 of Fig. 1.

Like reference characters refer to like parts throughout the followingdescription and the several figures of the accompanying drawing.

Referring to the drawing, the bit has a shank 10 provided with the usualsquared end 11 whereby'it may be stocked in the socket of an ordinarybrace. The shank 10 has an internal bore which is screw-threaded toengage a screw-threaded stem 12, extending up intothe bore and servingas a feeding member, as hereinafter described. This stem 12 is provided,at its lower end, with atapered portion 13, having cutting threads 14formed thereon, which are broken by a pair of spiral channels 15, and aboring point 16, the whole forming, in effect, a twist drill and alsoforming an anchorage means along which the boring mechanism, to bedescribed later, may be fed.

. The lower end of the shank 10 is enlarged to form a mandrel which isprovided with diametrically opposed recesses 17 for the reception of thelateral arms 18 of two side cutters which seat in the recesses 17, beingembraced at their top edges by downwardly projecting flanges 19 on themandrel, and resting at the'bottom 'onthe shoulders 20 of the recesses.

The cutters are secured to the mandrel by means of the following plates21 which are fastened to the mandrel by machine screws 22 and haveshoulders 23 bearing against the arms 18 ofthe cutters and resting onledges 24: formed at the edges of the shoul- Patented J an. 25, 1916.

ders 20 of the recesses the screws 22 being adjustable to securely clampthe arms 18 in place.

Substantially at right angles to the arms 18 of the cutters aredownwardly extending legs 25 which are curved slightly forwardandterminate in cutting edges 26 of the gouging type. At the rear thereofand eX tending below the same are thin cutting spurs- 27,,the spur ofone-cutter being at the outer side of the cutter, that of the otherbeing at the inner side of its cutter. Otherwise the cutters areidentical. L I

On the shank 10 of the bit-is an aperture forthe passage of a catch 28,adapated when pressed inwardly to engage a slot 29 formed meanwhileboring into the" wood, the-chips and shavings being removed through thespiral channels 15. When the drill or bor ing member penetrates farenough to firmly grip the wood the catch 28 is released, thus unlockingthe shank 10 from the stem 12. On continued operation of the brace theshank, carr'ying'the side cutter, will rotate about the screw-threadedstem which is held stationary by its position in the wood and will feeddown on the same,-thus bringing the side cutters into engagement withthe wood, the spurs27" first makingcontact as will be"obvious. As thesespursare at different distances from the center, the incisionscut'thereby' will have the form of two concentric circles, the distancebetween being substantially the width of the forward cutting edges 26,which, as the bit further feeds, willchisel out this portion. Thisaction continues until the material worked upon is-penetrated. It willbeapparent that thewoo'd is not cut to the full extent of the holedesired, but rather a disk is'v cut out and accordingly there is a?great economy-of labor. Owing'to th'e'firm grippingpurchase provided bythe central boring'member and to-the form of the side cutters, thehole'can be bored quickly'and easily.

In case'th'e wood to be bored is of any considerable thickness, theabove operation is carried out as-far as feasible. The bit is then'withdrawn leaving a circular wedge which can be knocked out, whereuponthe operation is repeated as often as necessary until-the-entire pieceis penetrated.

It willbe seen that holes of differe'nt diameters may be bored'by"altering the position's' of the side cutters; loosening the screws 22the arms 18 of the cutters may be shifted laterally to increase ordecrease the cutting" radius. The arms may be any length within therangeof practicability, or a set of side cutters having arms ofdifferent' lengths may be used if desired.

In the modification shown in Figs. 4 and tithe internal bore of theshank 10 is smooth, and in apertures 30 in the shank are pivotedscrew-threaded plates 31 adapted toengage the screw-threaded stem 12when pressed inwardly. This latter is accomplished by a cam ring 32,rotata-bleon the shank 1-0 and having cam surfaces 33' adapted to engageoutwardly projecting arms 34: of the-plates 31. It will be seen thatwhen the-ring 32 is rotated to bring the cam surfaces 33 in contact withthe arms'3 l. theplates 31 will be held in engagement with thescrew-threaded stem 12. Thenwhen the bit is rotatedthe shank will feeddown on'the stem as above described, the only difference being that thelatter is in engagement merely withthe plates 31 instead of with theentire'inner surface of the shank. The advantage of this form isthatwhen it'is-desired to move the stem 12 relatively to the shank, as forexample, to place the boring-and gripping member in the proper positionfor commencing operation, instead of having to unscrew itit is onlynecessary to turn the cam ring 32 to allow the plates 31 to move outofe'ngagement with the stem 12, whereupon the latter may be freely movedupand down as'desired.

Owing to the form of the rotating cutters the strain thereon is greatlylessened. The thin cuttingspurs'make their incisions with little str'ainand they leave only aonarrow, thin' strip" to be chiseled out by thetrans 105 verse cutters. Thus it will be apparent that thestrain on thecutters is much less-than it would be on'the o'rdinary'cutter.

Practically none of the" strain is on the sec'uring'plat'es2 1, as theforce against the side cutters binds the arms against the shoulders19and thus thestrain is taken by themandrel in such a'mane'r that the habilityofany of the parts breakingis to largeextent removed,

Thus, I have providectby my'invention, a portable, manually operated bitcapable of easilyand'quickly boring holes of considerable size" in softor. hardwood, and, at the same time, a bit adjustable to bore holes ofvarious-diameters. Q 1

Having thus described my invention what 7 I claim as new and desire tosecure by Let ters Patent is 3- In a' boring bit, a shank, athreaded'stem onwhich said shank feeds, an arm associated with saidshank, a cuttercarried by said arm revolving about said' stem at asubstantial distance therefrom, and a boxand anchoringmeinber associatedwith 139 said stem having a plurality of cutting edges at the endthereof for cutting and loosening material in advance of said member,said boring and anchoring member being provided with screw cuttingthreads for feeding it downwardly and preventing its withdrawal, and aplurality of channels leading from said cutting edges and extendingacross said threads affording passages for the material cut and loosenedby said cutting 1 edges.

In wltness whereof, I have hereunto subscribed my name 1n the presenceof two witnesses.

FRANK KONIECZKA. lVitnesses:

VINCENT KONIECZKA, VICTOR J. VYSZYNSKI.

Gopies cf this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

